Cochran, W. G., & Cochran, W. G. (1977). Sampling Techniques William G. Cochran. John Wiley &Sons.
Lua i Stíl Chicago (17ú heag.)Cochran, William G., agus William G. Cochran. Sampling Techniques William G. Cochran. John Wiley &Sons, 1977.
Lua MLA (8ú heag.)Cochran, William G., agus William G. Cochran. Sampling Techniques William G. Cochran. John Wiley &Sons, 1977.
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